Sorry for the delay in replying!
The side and rear windows are quite flat, I'm not sure if the rear is perfectly flat.
And many thanks for flow illustrating it. That looks not too bad, airflow-wise, to me.
Underneath there's a frontal 'undertray' composed of engine covers and a flattish floor, but at the back a huge airspace exists where the rear bumper looks like a parachute. I'm thinking of covering that with a flat piece of perspex or something.
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